The FIT221-3/8-BLK-INCHES is a heat shrinkable tubing made from cross-linked polyolefin, designed for insulation and protection. This tubing has a minimum supplied internal diameter of 0.375 inches and shrinks to a maximum recovered internal diameter of 0.187 inches, achieving a nominal wall thickness of 0.025 inches. It features an approximate 2:1 shrink ratio, an operating temperature range of -55°C to 135°C, and a full recovery temperature of 121°C. Rated for 600V under UL and CSA standards, it is ideal for providing electrical insulation, strain relief, and environmental sealing for wires, cables, and components.